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Update README.md

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kokke 2017-07-13 10:42:27 +02:00 committed by GitHub
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README.md
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@ -18,7 +18,7 @@ You can choose to use one or both of the modes-of-operation, by defining the sym
There is no built-in error checking or protection from out-of-bounds memory access errors as a result of malicious input. The two functions AES_ECB_xxcrypt() do most of the work, and they expect inputs of 128 bit length.
The module uses around 200 bytes of RAM and 2.5K ROM when compiled for ARM (~2K for Thumb but YMMV).
The module uses less than 200 bytes of RAM and 2.3K ROM when compiled for ARM (<2K for Thumb but YMMV).
It is one of the smallest implementation in C I've seen yet, but do contact me if you know of something smaller (or have improvements to the code here).
@ -26,22 +26,18 @@ I've successfully used the code on 64bit x86, 32bit ARM and 8 bit AVR platforms.
GCC size output when only ECB mode is compiled for ARM (using 128 bit block size):
$ arm-none-eabi-gcc -Os -c aes.c -DCBC=0
$ size aes.o
text data bss dec hex filename
2316 0 184 2500 9cb aes.o
2071 0 184 2255 8cf aes.o
.. and when compiling for the THUMB instruction set, we end up just above 1.7K in code size.
.. and when compiling for the THUMB instruction set, we end up around 2K in code size.
$ arm-none-eabi-gcc -mthumb -Os -c aes.c -DCBC=0
$ arm-none-eabi-gcc -mthumb -Os -c aes.c -DCBC=0 -DAES128=1
$ size aes.o
text data bss dec hex filename
1796 0 184 1980 7a7 aes.o
1551 0 184 1735 6c7 aes.o